From Manufacturer's Label:Gold Standard 100% Whey contains Whey Protein Isolates (WPIs) - the purest form of whey protein that currently exists. By using WPI as the primary ingredient along with premium ultra-filtered whey protein concentrate (WPC), we’re able to pack 24 grams of muscle- building protein into every serving. ON’s attention to detail also extends to mixability. This superior quality powder has been instantized to mix easily using a shaker cup or just a glass and spoon. There’s no doubt that this is the standard by which all other whey proteins are measured. Beyond the basics: